pkg/front_end/parser_testcases/nnbd/issue_49678.dart

dynamic g(num? i) {
  Map<int?, int> m = {0: 1};
  m[i as int?];

  var list = [i as int?, i as int?, i as int?];
  var list2 = [i is int?, i is int?, i is int?];
  return [list.first, list2.first];
}